in ‧ fe ‧ ri ‧ or ‧ i ‧ ty /ɪnˌfɪəriˈɒrəti, ɪnˌfɪəriˈɒrɪti $ -ˌfɪriˈɔːr-/ BrE AmE noun [uncountable]
when someone or something is not good or not as good as someone or something else OPP superiority :
moral inferiority
sense/feeling of inferiority
He had a deep-rooted feeling of inferiority.